فرمت فایل: پاورپوینت - ppt  

کتاب سبز - قابل ویرایش ) 

تعداد اسلاید : 6
Laser radiation versus “ordinary light” In contrast to light from an ordinary light bulb, laser radiation is generally very focused. High intensity of radiation even for very low power rating of laser. (A 50 Watt laser can be very dangerous while a 50 Watt light bulb is rather harmless). When high intensities are absorbed in biological or other materials they can cause damage (eye damage, blindness, burns of other body parts, fire). The probability of damage depends on the type of laser used and whether appropriate safety precautions are in place. Laser safety classes Class I Inherently safe; no possibility of eye damage. This can be either because of a low output power (in which cases eye damage is impossible even after hours of exposure), or due to an enclosure that cannot be opened in normal operation without the laser being switched off automatically, such as in CD players. Class II The blinking reflex of the human eye (aversion response) will prevent eye damage, unless the person deliberately stares into the beam. Output powers up to 1mW. This class contains lasers that emit visible light only. Some laser pointers are in this category. Class IIa A region in the low-power end of Class II where the laser requires in excess of 1000seconds of continuous viewing to produce a burn to the retina. Supermarket laser scanners are in this subclass. Class IIIa Lasers in this class are mostly dangerous in combination with optical instruments which change the beam diameter. Output powers 1–5 mW. Maximum power density in the beam is 2.5 mW/square cm. Many laser pointers are in this category. Laser safety classes Generally one can state that a laser is more dangerous with: (i) Higher power Higher intensty means more power per time that can cause damage when the light is absorbed (ii) Less visibility of its wavelength Infrared and ultraviolet light will not cause the blinking reflex (aversion response)of the human eye, This means the retina will be exposed longer and the damagewill therefore be greater (iii) Higher intensity (stronger focus of the light) Stronger focus means more power per area which means that the damage may be more but at the same time worse. What you need to know (with regard to safety) about the lasers used in the Modern Optics Lab: Modern Optics Lab Safety Rules

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